Net loss attributable to common stockholders was $3.0 million, or $0.06 per basic and diluted share.

Cash and cash equivalents totaled $82.0 million as of September 30, 2012, compared to $104.3 million as of December 31, 2011.

Recent Business Highlights

-- Sales and Marketing

Both Bilive sales and Healive sales in the private pay market continued to exhibit solid year-over-year growth in the third quarter compared to the same period of 2011. In addition to the private pay market sales growth, Sinovac continues to execute its sales plan in the public market. In the past few months, the Company was awarded multiple provincial tender awards for both Healive and Anflu. Besides the tender awards in Gansu Province, Beijing, and Shanghai previously announced, in October, Sinovac was selected by Jiangsu Centers for Disease Control and Prevention (Jiangsu CDC) as one of the two vaccine manufacturers to supply inactivated hepatitis A vaccine for the EPI in Jiangsu province in 2013. In the third quarter, total sales were mainly impacted by the decrease of Healive revenue in the public market, and sales are expected to increase in the coming quarters after vaccine delivery.

-- Phase III Clinical Trial for EV71 Vaccine Candidate

The EV71 vaccine Phase III clinical trial is progressing on schedule. The hand, foot and mouth disease (HFMD) case surveillance is ongoing, and documentation collection, data input, data review, and quality control on the database are well underway and progressing on schedule.

-- Mumps Vaccine Progress

In the third quarter, Sinovac Biotech received Good Manufacturing Practices (GMP) certification from the China SFDA for the Company's dedicated mumps vaccine production plant at its Sinovac Dalian facility.

-- 2012 Annual General Meeting

On August 22, 2012, Sinovac held its 2012 Annual General Meeting of shareholders. During the meeting, four proposals, including the 2012 Share Incentive Plan were approved, while a fifth, a proposal to amend the Company's by-laws, was not approved.

Dr. Weidong Yin, Chairman, President and CEO of Sinovac, commented, "During the third quarter 2012, our hepatitis vaccine business grew in the private pay market, while the Healive sales in the public market decreased compared to the same period of last year, impacting our total sales. In the coming quarters we expect sales of Healive in the public market will pick up, as we continue to improve our capabilities and expand our presence in that market."

Dr. Yin continued, "We expect the commercialization of our EV71 vaccine to become our key future growth catalyst. Currently, the Phase III clinical trial of our EV71 vaccine is being executed smoothly and moving forward well on schedule. We remain in close communication with the relevant authorities and experts on the expected schedule for trial conclusion and data unblinding, and we will share that information when appropriate."

Dr. Yin concluded, "Our cash position and credit line facilities with local commercial banks provide us with the resources to commercialize our EV71 vaccine being developed for HFMD. We are in the position to drive the future growth of our business with a combination of commercialized vaccines and vaccine candidates."

Financial Review for Third Quarter Ended September 30, 2012

An analysis of sales and gross profit is as follows:

In USD

2012Q3

% of Sales

2011Q3

%of Sales

Increase / - Decrease %

Hepatitis A – Healive

4,931,790

34.5%

5,595,358

36.4%

-11.9%

Hepatitis A&B – Bilive

5,548,237

38.9%

5,205,478

33.9%

6.6%

Hepatitis vaccines

10,480,027

73.4%

10,800,836

70.3%

-3.0%

Influenza vaccines

3,806,454

26.6%

4,560,961

29.7%

-16.5%

Animal vaccine

619

0.0%

Total sales

14,287,100

100%

15,361,797

100%

-7.0%

Cost of goods sold

6,770,712

47.4%

6,631,672

43.2%

2.1%

Gross profit

7,516,388

52.6%

8,730,125

56.8%

-13.9%

Total sales in the third quarter of 2012 decreased 7.0%, compared to $15.4 million in the same period of 2011.

The decrease in total third quarter 2012 sales were primarily due to decreased Healive sales to the public market and reduced Anflu sales that started later this year. This was partially offset by the increase of both Healive and Bilive sales in the private pay market. The Company ended the quarter with a net total sales decrease of $1.1 million, or 7.0%, compared to the same quarter of last year.

Core vaccines sales for the nine months period ended September 30, 2012, increased 6.0% to $29.6 million, compared to $28.0 million in the same period of 2011. Despite a 29.0% increase in Bilive sales, total sales decreased 17.0% to $29.6 million, compared to $35.7 million in the same period of last year. The decrease was mainly affected by non-core government stockpiling of the pandemic flu H5N1 vaccine sales of $7.7 million in the 2011 period, as there were no government stockpiling sales in the current fiscal year to date. Please refer to note 1 below for the sales analysis for the nine months period ended September 30, 2012.

Gross margin in third quarter of 2012 was 52.6%, compared to 56.8% in the same period of last year. The lower quarterly gross margin was mainly due to the increased provision for expired H1N1 inventory costs and overhead allocated to cost of goods sold arising from seasonal excess capacity. After deducting depreciation of land use rights, amortization of licenses and permits, the gross margin was 52.4% and 56.5% for the third quarter of 2012 and 2011, respectively.

Selling, general and administrative expenses as a percentage of third quarter 2012 sales were 54.9%, compared to 49.8% for the same quarter of the prior year. The increase in the year-over-year quarterly SG&A expenses was mainly due to the ongoing preparation costs for the GMP upgrade and the Changping site validation.

Research and development expenses for the third quarter were $3.8 million, a $1.4 million increase over the same period in 2011, mainly due to the ongoing EV71 clinical trial development.

The increase in depreciation of property, plant and equipment and amortization of licenses and permits for the third quarter of 2012 was mainly due to the assets at Changping site that were in use in the quarter.

As of September 30, 2012, cash and cash equivalents totaled $82.0 million, compared to $104.3 million as of December 31, 2012. The Company utilized $1.1 million and $6.5 million of its cash resources in the third quarter and nine months period, respectively, to contribute to its ongoing clinical trial for its proprietary EV71 vaccine. The Company intends to provide the trial with approximately an additional $3.4 million during the remaining quarter of the year and $1.5 million in 2013. During the quarter and the first nine months period, $3.7 million and $8.7 million, respectively, were spent for the ongoing capital needs of the Changping site development, which were in part covered by the credit line arrangements already in place. Capital expenditure payments to complete the Changping site, which are in part covered by the credit line arrangements, are estimated up to $7.0 million in the remaining quarter of 2012 and $8.7 million in 2013. The cash position and credit line facilities with local commercial banks provide the Company with the resources to commercialize the EV71 vaccine being developed for HFMD. The Company is in the position to drive the future growth of the business with a combination of commercialized vaccines and vaccine candidates.

Note 1

Sales Analysis for the Nine-month Period ended September 30, 2012

In USD

2012 1-9

% of sales

2011 1-9

%of sales

Increase / - Decrease %

Hepatitis A – Healive

10,104,218

34.1%

11,246,591

31.5%

-10.2%

Hepatitis A&B – Bilive

15,633,272

52.8%

12,116,369

33.9%

29.0%

Hepatitis vaccines

25,737,490

86.9%

23,362,960

65.4%

10.2%

Influenza vaccines

3,852,860

13.0%

4,588,828

12.9%

-16.0%

Animal vaccine

Core vaccines

34,849

29,625,199

0.1%

100%

-

27,951,788

-

78.3%

6.0%

H5N1

-

-

7,746,700

21.7%

Total sales

29,625,199

100%

35,698,488

100%

-17.0%

Cost of goods sold

10,401,918

35.1%

13,095,652

36.7%

-20.6%

Gross profit

19,223,281

64.9%

22,602,836

63.3%

-15.0%

Conference Call Details

The Company will host a conference call on Thursday, November 15, 2012 at 8:00 a.m. EST (November 15, 2012 at 9:00 p.m. China Standard Time) to review the Company's financial results and provide an update on recent corporate developments. To access the conference call, please dial 1-877-407-4018 (USA) or 1-201-689-8471 (International). A replay of the call will be available from 11 a.m. EST on November 15, 2012 to November 29, 2012 at midnight. To access the replay, please dial 1-877-870-5176 (USA) or 1-858-384-5517 (International) and reference the replay pin number 403079.

A live audio webcast of the call will also be available from the investors section on the corporate web site at www.sinovac.com. A webcast replay can be accessed on the corporate website beginning November 15, 2012, and the replay will remain available for 30 days.

About Sinovac

Sinovac Biotech Ltd. is a China-based biopharmaceutical company that focuses on research, development, manufacturing and commercialization of vaccines that protect against human infectious diseases including hepatitis A and B, seasonal influenza, H5N1 pandemic influenza and mumps, as well as animal rabies vaccine. In 2009, Sinovac was the first company worldwide to receive approval for its H1N1 influenza vaccine, Panflu.1, and has manufactured it for the Chinese Central Government, pursuant to the government-stockpiling program. The company is also the only supplier of the H5N1 pandemic influenza vaccine to the government-stockpiling program. Sinovac is developing a number of new pipeline vaccines including vaccines for enterovirus 71 (against hand, foot, and mouth disease), of which the EV71 vaccine is currently in Phase III clinical trials, pneumococcal conjugate, pneumococcal polysaccharides, varicella and rubella. Sinovac sells its vaccines mainly in China and exports selected vaccines to Mongolia, Nepal, and the Philippines.

Safe Harbor Statement

This announcement contains forward-looking statements. These statements are made under the "safe harbor" provisions of the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified by words or phrases such as "will," "expects," "anticipates," "future," "intends," "plans," "believes," "estimates" and similar statements. Among other things, the business outlook and quotations from management in this press release contain forward-looking statements. Statements that are not historical facts, including statements about Sinovac's beliefs and expectations, are forward-looking statements. Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statement. Sinovac does not undertake any obligation to update any forward-looking statement, except as required under applicable law.

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